condition mean min max ZT0-3 24.885959 24.885959 24.885959 ZT4-7 27.512766 27.512766 27.512766 ZT8-11 32.100595 32.100595 32.100595 ZT12-15 35.3615255 35.3615255 35.3615255 ZT16-19 33.664316 33.664316 33.664316 ZT20-23 36.9776935 36.9776935 36.9776935